How Is O.T.P Generated?

The most common way for the

generation of OTP is the Time

Based One Time Passwords (OTP)

In these OTP systems, time is the

Main factor to generate the

unique password.The password generated is created using the current time and a secret key.

Backend server generates the secret key

The server shares secret key with the

service generating the OTP

After this step It looks Like

"0215a Td8el5b

2 2|16-82b643

4felbela 1f6ba"

A hash based message authentication

code (HMAC) is generated using the

SHA-1 algorithm.

A 20 bytes long code truncated to required size.

The lastcharacter is taken and an OFFSET is determined At This step otp is- 288083

The counter is started and otp is sent...

By-Vikash Bharal

Thank You